public class Computer {
    private String cpu;
    private String memory;
    public String screen;
    String brand;   //default属性

    public Computer(String brand,String cpu,String memory,String screen) {
        this.brand = brand;
        this.cpu = cpu;
        this.memory = memory;
        this.screen = screen;
    }

    public void Boot() {
        System.out.println("开机~~~");
    }

    public void PowerOff() {
        System.out.println("关机~~~");
    }

    public void SurfInternet() {
        System.out.println("上网~~~");
    }
}
